Proton
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Proton Mail is the world's largest secure email provider. Swiss, end-to-end encrypted, private, and free.
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Proton Drive is a free end-to-end encrypted cloud storage that allows you to securely backup and share your files. It's open source, publicly audited, and Swiss-based.
Proton Pass Proton Pass is a free and open-source password manager which brings a higher level of security with rigorous end-to-end encryption of all data (including usernames, URLs, notes, and more) and email alias support.
SimpleLogin lets you send and receive emails anonymously via easily-generated unique email aliases.
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I’m inclined to think that they look for known data breaches using your email address or alias, and if found they will tell you what kind of data is associated with the breach; e.g., social security, physical address, etc. So they don’t need to actually know that information, because they’re not searching using that information.